Referring to the infamous staircase descent in chick-flick movies, in which the female lead, usually in slow motion, walks down the staircase, looking totally beautiful, or in mockery, totally ugly, and falls. Generally before a party or school dance. Mocked in several movies, and has been noted in television as well as real life. You know you want it. But you can't have it.

"Her descent was magnificent, and she looked beautiful."
"She had practiced, yet failed at her descent and fell."
"Haha I love the descent part of movies, especially if they fall."